The image enclosed appears to show the front of a Model S peering out from under a partially open garage door emblazoned with the letter D. Just what that letter stands for, we don't know. Usually we'd guess it stood for "diesel," but given that Teslas are powered purely by electricity, that'd probably be viewed as a backwards step. Drive? Possibly, if Tesla has an all-wheel-drive sedan in the works (which is does).
Whatever it is, we'll have to wait until October 9 before Tesla reveals the full thing. At that point it will also reveal "something else," though it's given even less indication as to what that might be. The Model 3? Production-ready Model X? A new Roadster? We'll find out in a week's time.